Coarsening kinetics of coherent precipitates in Ni-Al-Mo and Fe-Ni-Al alloys

Calderón, Héctor A.; Kostorz, G.; Dorantes, H.; Cruz, Javier; Cabañas-Moreno, J. Gerardo

doi:10.1016/s0921-5093(98)80012-9

Cited by 30 publications

(9 citation statements)

References 14 publications

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“…The coarsening behavior of the precipitates is significant for the long-term creep properties 60 . It has been shown that the low mismatch between the precipitate and the matrix in FBB8 is effective in suppressing the structural change, and, thus, leads to the excellent resistance to precipitate coarsening during exposure to elevated temperatures 24 37 .…”

Section: Discussionmentioning

confidence: 99%

Ferritic Alloys with Extreme Creep Resistance via Coherent Hierarchical Precipitates

Song

Sun

Lü

et al. 2015

Sci Rep

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There have been numerous efforts to develop creep-resistant materials strengthened by incoherent particles at high temperatures and stresses in response to future energy needs for steam turbines in thermal-power plants. However, the microstructural instability of the incoherent-particle-strengthened ferritic steels limits their application to temperatures below 900 K. Here, we report a novel ferritic alloy with the excellent creep resistance enhanced by coherent hierarchical precipitates, using the integrated experimental (transmission-electron microscopy/scanning-transmission-electron microscopy, in-situ neutron diffraction, and atom-probe tomography) and theoretical (crystal-plasticity finite-element modeling) approaches. This alloy is strengthened by nano-scaled L21-Ni2TiAl (Heusler phase)-based precipitates, which themselves contain coherent nano-scaled B2 zones. These coherent hierarchical precipitates are uniformly distributed within the Fe matrix. Our hierarchical structure material exhibits the superior creep resistance at 973 K in terms of the minimal creep rate, which is four orders of magnitude lower than that of conventional ferritic steels. These results provide a new alloy-design strategy using the novel concept of hierarchical precipitates and the fundamental science for developing creep-resistant ferritic alloys. The present research will broaden the applications of ferritic alloys to higher temperatures.

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Section: Discussionmentioning

confidence: 99%

Ferritic Alloys with Extreme Creep Resistance via Coherent Hierarchical Precipitates

Song

Sun

Lü

et al. 2015

Sci Rep

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“…The island shape transition from wire-like to the optimal shape of dome-like square base island is dominated by the driving force associated with minimization of its total surface and interface energies as discussed in our model. Therefore, the faceting process provides the possibility to stabilize the island configuration and reach its equilibrium state [32][33][34]. At high temperatures, deposited Fe adatoms can obtain sufficient energy to overcome surface and interface diffusion barriers, or corner barriers, and can rapidly diffuse on the substrate as well as the facets to find the most stable sites, subsequently forming low surface/interface energy facets/planes.…”

Section: Discussionmentioning

confidence: 99%

Shape transition of endotaxial islands growth from kinetically constrained to equilibrium regimes

Tok

Foo

2013

Materials Research Bulletin

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“…Further studies have been conducted to develop Fe-Ni-Cr-Al-Mo alloys by taking the advantage of higher oxidation resistance of ferritic Fe-Cr-Al system and higher mechanical properties at high temperatures of Fe-Ni-Al, still by strengthening of more complex B2-ordered (Fe,Ni)Al [10,11]. In these alloys Mo mostly contributes to the solid solution strengthening of the matrix, but it could also influence the surface energy of matrix-precipitet (B2-α-Fe) interphase, and reduces the coarsening rates of the precipitates [12]. As normally valid in most high temperature alloys, both Al and Cr are expected act as the elements that produce protective scales of Al2O3 and Cr2O3 or spinels for high temperature oxidation and hot corrosion resistant [11].…”

Section: Introductionmentioning

confidence: 99%

MICROSTRUCTURAL EVOLUTION AND COARSENING KINETICS OF B2-(Fe,Ni)Al IN FERITIC STEEL OF Fe-14Ni-9Al-7,5Cr-1Mo AT HIGH TEMPERATURES.

Basuki¹,

Bachri²,

Prajitno

2020

urania

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MICROSTRUCTURAL EVOLUTION AND COARSENING KINETICS OF B2-(Fe,Ni)Al IN FERRITIC STEEL OF Fe-14Ni-9Al-7,5Cr-1Mo AT HIGH TEMPERATURES. Increasing the efficiency of power plant facilities, such as steam power plant, is demanding, and this drives to the development of materials capable for higher temperature operations. Ferritic steels have been widely used for boiler components due to their relatively economical and higher in thermal conductivity. Nevertheless, the application of ferritic steels for boilers is limited only at 630 ℃ due to their weakness in creep strength and corrosion at higher temperatures. Efforts to increase the performance of ferritic steels at higher temperature applications have been intensively carried out, one of which is by developing B2-(Fe,Ni)Al precipitates in the ferrite matrix. This paper discusses the microstructural evolution in alloy of Fe-14Ni-9Al-7.5Cr-1Mo (in wt.%) strengthened by B2-(Fe,Ni)Al precipitates during heating at 800, 900, and 1000 oC for 6, 20 and 48 hours. Ageing at 800 oC for 6 hours gave rounded cuboidal B2-(Fe,Ni)Al precipitates dispersed homogeneously in the ferrite matrix and changed to rounded shape at longer ageing times. At 1000 oC, however, the precipitates had rounded shape at all times of ageing. Coarsening of precipitates occurred during ageing at 800 and 1000 oC with the rate constants of 5,7 x 104 nm3/h and 2,1 x106 nm3/h respectively, which is considered relatively low. The highest hardness value of 520 HVN was observed for the sample aged at 1000 °C for 6 hours.Keywords: Ferritic steels, B2-(Fe,Ni)Al precipitate, coarsening, microstructure evolution

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Coarsening kinetics of coherent precipitates in Ni-Al-Mo and Fe-Ni-Al alloys

Cited by 30 publications

References 14 publications

Ferritic Alloys with Extreme Creep Resistance via Coherent Hierarchical Precipitates

Ferritic Alloys with Extreme Creep Resistance via Coherent Hierarchical Precipitates

Shape transition of endotaxial islands growth from kinetically constrained to equilibrium regimes

MICROSTRUCTURAL EVOLUTION AND COARSENING KINETICS OF B2-(Fe,Ni)Al IN FERITIC STEEL OF Fe-14Ni-9Al-7,5Cr-1Mo AT HIGH TEMPERATURES.

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